On Fri, Jun 26, 2015 at 01:02:51PM +0200, Hans de Goede wrote:
> Hi,
>
> On 26-06-15 12:20, Maxime Ripard wrote:
> >Hi,
> >
> >On Sun, Jun 14, 2015 at 12:40:11PM +0200, Hans de Goede wrote:
> >>Paul, can you test these with gadget mode? Specifically if they help the
> >>problem you were seeing when switching roles?
> >>
> >>Also this bit from the kernel code for the sunxi glue may be relevant
> >>to your problems:
> >>
> >> if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb)) {
> >> /* ep0 FADDR must be 0 when (re)entering peripheral mode */
> >> musb_ep_select(musb->mregs, 0);
> >> musb_writeb(musb->mregs, MUSB_FADDR, 0);
> >> }
> >>
> >>This is from the interrupt handler in the sunxi-musb glue in the kernel,
> >>maybe we can do the same, and/or maybe we need to do:
> >>
> >> /* ep0 FADDR must be 0 when (re)entering peripheral mode */
> >> musb_ep_select(musb->mregs, 0);
> >> musb_writeb(musb->mregs, MUSB_FADDR, 0);
> >>
> >> From sunxi_musb_disable?
> >
> >So, I was affected by this issue on a SinA33, even when not switching
> >roles (since the SinA33 is peripheral only).
>
> Missed this the first reply, are you sure, that is somewhat weird. I mean
> it is possible if they did not hook up the id pin, or do not allow you
> to send out +5v, but it is weird. I guess they did route the real usb-host
> to an USB-A receptacle on that board, so it is not a big deal, right ?Yeah, I'm sure, or at least that's what the schematics say. VBUS comes straight from the DC-5V (without any GPIO in between), goes through a jumper (you read me right....), which is even un-populated on the boards Chen-Yu and I got. So it seems like while the board has the ID pin routed, it's actually not able to provide VBUS (which is kind of weird, but anyway). Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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